Add TesnorRT support in cpp deployment (#704)

* Add TesnorRT support in cpp deployment
* Change putText style

deploy/cpp/docs/linux_build.md

 # Linux平台编译指南
 
 ## 说明
-本文档在 `Linux`平台使用`GCC 4.8.5` 和 `GCC 4.9.4`测试过，如果需要使用更高G++版本编译使用，则需要重新编译Paddle预测库，请参考: [从源码编译Paddle预测库](https://www.paddlepaddle.org.cn/documentation/docs/zh/develop/advanced_usage/deploy/inference/build_and_install_lib_cn.html#id15)。
+本文档在 `Linux`平台使用`GCC 4.8.5` 和 `GCC 4.9.4`测试过，如果需要使用更高G++版本编译使用，则需要重新编译Paddle预测库，请参考: [从源码编译Paddle预测库](https://www.paddlepaddle.org.cn/documentation/docs/zh/develop/advanced_guide/inference_deployment/inference/build_and_install_lib_cn.html)。
 
 ## 前置条件
 * G++ 4.8.2 ~ 4.9.4
@@ -19,7 +19,7 @@
 
 ### Step2: 下载PaddlePaddle C++ 预测库 fluid_inference
 
-PaddlePaddle C++ 预测库针对不同的`CPU`和`CUDA`版本提供了不同的预编译版本，请根据实际情况下载:  [C++预测库下载列表](https://www.paddlepaddle.org.cn/documentation/docs/zh/develop/advanced_usage/deploy/inference/build_and_install_lib_cn.html)
+PaddlePaddle C++ 预测库针对不同的`CPU`和`CUDA`版本提供了不同的预编译版本，请根据实际情况下载:  [C++预测库下载列表](https://www.paddlepaddle.org.cn/documentation/docs/zh/develop/advanced_guide/inference_deployment/inference/build_and_install_lib_cn.html)
 
 
 下载并解压后`/root/projects/fluid_inference`目录包含内容为：
@@ -39,6 +39,8 @@ fluid_inference
 
 编译`cmake`的命令在`scripts/build.sh`中，请根据实际情况修改主要参数，其主要内容说明如下：
 
+```
+
 # 是否使用GPU(即是否使用 CUDA)
 WITH_GPU=OFF
 # 使用MKL or openblas
@@ -93,6 +95,7 @@ make
 | image_path  | 要预测的图片文件路径 |
 | video_path  | 要预测的视频文件路径 |
 | use_gpu  | 是否使用 GPU 预测, 支持值为0或1(默认值为0)|
+| --run_mode |使用GPU时，默认为fluid, 可选（fluid/trt_fp32/trt_fp16）|
 
 **注意**：如果同时设置了`video_path`和`image_path`，程序仅预测`video_path`。
 

deploy/cpp/include/object_detector.h

@@ -54,17 +54,21 @@ cv::Mat VisualizeResult(const cv::Mat& img,
 
 class ObjectDetector {
  public:
-  explicit ObjectDetector(const std::string& model_dir, bool use_gpu = false) {
+  explicit ObjectDetector(const std::string& model_dir, bool use_gpu = false,
+                          const std::string& run_mode = "fluid") {
     config_.load_config(model_dir);
     threshold_ = config_.draw_threshold_;
     preprocessor_.Init(config_.preprocess_info_, config_.arch_);
-    LoadModel(model_dir, use_gpu);
+    LoadModel(model_dir, use_gpu, config_.min_subgraph_size_, 1, run_mode);
   }
 
   // Load Paddle inference model
   void LoadModel(
     const std::string& model_dir,
-    bool use_gpu);
+    bool use_gpu,
+    const int min_subgraph_size,
+    const int batch_size = 1,
+    const std::string& run_mode = "fluid");
 
   // Run predictor
   void Predict(

deploy/cpp/scripts/build.sh

@@ -4,7 +4,7 @@ WITH_GPU=OFF
 WITH_MKL=ON
 # 是否集成 TensorRT(仅WITH_GPU=ON 有效)
 WITH_TENSORRT=OFF
-# TensorRT 的lib路径
+# TensorRT 的路径
 TENSORRT_DIR=/path/to/TensorRT/
 # Paddle 预测库路径
 PADDLE_DIR=/path/to/fluid_inference/

deploy/cpp/src/main.cc

@@ -25,6 +25,7 @@ DEFINE_string(model_dir, "", "Path of inference model");
 DEFINE_string(image_path, "", "Path of input image");
 DEFINE_string(video_path, "", "Path of input video");
 DEFINE_bool(use_gpu, false, "Infering with GPU or CPU");
+DEFINE_string(run_mode, "fluid", "mode of running(fluid/trt_fp32/trt_fp16)");
 
 void PredictVideo(const std::string& video_path,
                   PaddleDetection::ObjectDetector* det) {
@@ -93,7 +94,10 @@ void PredictImage(const std::string& image_path,
   auto colormap = PaddleDetection::GenerateColorMap(labels.size());
   cv::Mat vis_img = PaddleDetection::VisualizeResult(
       im, result, labels, colormap);
-  cv::imwrite("output.jpeg", vis_img);
+  std::vector<int> compression_params;
+  compression_params.push_back(CV_IMWRITE_JPEG_QUALITY);
+  compression_params.push_back(95);
+  cv::imwrite("output.jpeg", vis_img, compression_params);
   printf("Visualized output saved as output.jpeg\n");
 }
 
@@ -106,9 +110,15 @@ int main(int argc, char** argv) {
                 << "--image_path=/PATH/TO/INPUT/IMAGE/" << std::endl;
     return -1;
   }
+  if (!(FLAGS_run_mode == "fluid" || FLAGS_run_mode == "trt_fp32"
+      || FLAGS_run_mode == "trt_fp16")) {
+    std::cout << "run_mode should be 'fluid', 'trt_fp32' or 'trt_fp16'.";
+    return -1;
+  }
 
   // Load model and create a object detector
-  PaddleDetection::ObjectDetector det(FLAGS_model_dir, FLAGS_use_gpu);
+  PaddleDetection::ObjectDetector det(FLAGS_model_dir, FLAGS_use_gpu,
+    FLAGS_run_mode);
   // Do inference on input video or image
   if (!FLAGS_video_path.empty()) {
     PredictVideo(FLAGS_video_path, &det);

deploy/cpp/src/object_detector.cc

@@ -17,13 +17,36 @@
 namespace PaddleDetection {
 
 // Load Model and create model predictor
-void ObjectDetector::LoadModel(const std::string& model_dir, bool use_gpu) {
+void ObjectDetector::LoadModel(const std::string& model_dir,
+                               bool use_gpu,
+                               const int batch_size,
+                               const int min_subgraph_size,
+                               const std::string& run_mode) {
   paddle::AnalysisConfig config;
   std::string prog_file = model_dir + OS_PATH_SEP + "__model__";
   std::string params_file = model_dir + OS_PATH_SEP + "__params__";
   config.SetModel(prog_file, params_file);
   if (use_gpu) {
     config.EnableUseGpu(100, 0);
+    if (run_mode != "fluid") {
+      auto precision = paddle::AnalysisConfig::Precision::kFloat32;
+      if (run_mode == "trt_fp16") {
+        precision = paddle::AnalysisConfig::Precision::kHalf;
+      } else if (run_mode == "trt_int8") {
+        precision = paddle::AnalysisConfig::Precision::kInt8;
+      } else {
+        if (run_mode != "trt_32") {
+          printf("run_mode should be 'fluid', 'trt_fp32' or 'trt_fp16'");
+        }
+      }
+      config.EnableTensorRtEngine(
+          1 << 10,
+          batch_size,
+          min_subgraph_size,
+          precision,
+          false,
+          run_mode == "trt_int8");
+    }
   } else {
     config.DisableGpu();
   }
@@ -51,6 +74,7 @@ cv::Mat VisualizeResult(const cv::Mat& img,
     int c2 = colormap[3 * results[i].class_id + 1];
     int c3 = colormap[3 * results[i].class_id + 2];
     cv::Scalar roi_color = cv::Scalar(c1, c2, c3);
+    text += " ";
     text += std::to_string(static_cast<int>(results[i].confidence * 100)) + "%";
     int font_face = cv::FONT_HERSHEY_COMPLEX_SMALL;
     double font_scale = 0.5f;
@@ -60,12 +84,6 @@ cv::Mat VisualizeResult(const cv::Mat& img,
                                          font_scale,
                                          thickness,
                                          nullptr);
-    float new_font_scale = roi.width * font_scale / text_size.width;
-    text_size = cv::getTextSize(text,
-                               font_face,
-                               new_font_scale,
-                               thickness,
-                               nullptr);
     cv::Point origin;
     origin.x = roi.x;
     origin.y = roi.y;
@@ -83,7 +101,7 @@ cv::Mat VisualizeResult(const cv::Mat& img,
                 text,
                 origin,
                 font_face,
-                new_font_scale,
+                font_scale,
                 cv::Scalar(255, 255, 255),
                 thickness);
   }